<?php
function widget_ad_pic(&$setting, &$system)
{
    $output = $system->loadModel('system/frontend');
    if ($output->theme) {
        $theme_dir = $system->base_url() . 'themes/' . $output->theme;
    } else {
        $theme_dir = $system->base_url() . 'themes/' . $system->getConf('system.ui.current_theme');
    }
    $setting['ad_pic'] = str_replace('%THEME%', $theme_dir, $setting['ad_pic']);
    return $setting;
}

?>
